[PORT] [LG] optimize inline text evaluation

[tomlm]

Port this change from botbuilder-dotnet/master branch:
microsoft/botbuilder-dotnet#3387

Originally, we do parse the additional inline text directly.

In this pr, we will add a new text parser, that accepts the text and original LGFile both.
So, there will be no intermediate error messages appearing in parse directly.
At the same time, no impact on parse performance.

close: #3352

Changed projects

• Microsoft.Bot.Builder.LanguageGeneration
• Microsoft.Bot.Builder.Dialogs.Adaptive.Templates.Tests
• Microsoft.Bot.Builder.LanguageGeneration.Tests